v.使加倍；使成双（double的ing形式）；绕过；握紧
n.加倍；并线；折回；防护板；衬里
adj.双重的；折叠的
doublings───n.加倍；并线；折回；防护板；衬里；v.使加倍；使成双（double的ing形式）；绕过；握紧；adj.双重的；折叠的
doubting───adj.不相信的，有疑心的；v.无把握；怀疑；（古）害怕（doubt的现在分词）
redoubling───v.使成四倍；再折叠（redouble的ing形式）；n.再加倍；再折叠
undoubling───vt.使松开；使伸直；使不再成倍；vi.展开；伸直；不再成倍
troubling───adj.令人不安的;令人烦恼的
double wing───双翼
double-ring───双轮；复轮
doubling up───倍增保额弥补法
double wings───双翼
Doubling the frequency of logical operations inside a microprocessor doubles the heat output.───微处理器内部逻辑操作的频率加倍，产生的热量也加倍。
Losing a job is hurting: you don't skip down to the job centre with a song in your heart, delighted at the prospect of doubling your income from the generous state.───失去一份工作是痛苦的：你不会在心里哼着歌蹦蹦跳跳地去就业中心，为你能从这个慷慨的国家获得双倍收入而高兴。
Meat output 'doubling'.───肉类产量的“加倍”。
She began to kick and claw at him, writhing, doubling as she fought against him, more animal than human.───她开始对他又踢又抓，一边同他挣打，一边翻腾，弯曲着身体，就像一头野兽。
Domestication of cattle alone may have been responsible for a doubling of world human population in a few generations.───牛的驯服独自地可能在几世代之内已经负责世界的成两倍人人类的人口。
Without it, a cargo ship sailing from Italy to Singapore had to go around the southern tip of Africa, doubling the time and distance.───没有它，一个意大利货轮到新加坡不得不绕过非洲南端，双倍的时间和距离。
He was supposed to be seeking the support of the business community for a doubling of exports over the next five years.───他本应该寻求商界的帮助，以求在未来五年使得出口增长一倍。
Obama has set a goal of doubling U. S. exports to $3. 14 trillion a year by the end of 2014 and he said Asia is key to that goal.───奥巴马制定了在2014年底将美国出口额增加一倍到3.14万亿，而亚洲是完成这一策略的关键。
The company now bulletproofs about 80 vehicles a year and is doubling its manufacturing space.───现在这家公司每年为80辆车换上防弹外壳。
He is doubling the parts of a preacher and a teacher.